Byron,

Welcome to the forum. This thread has been inactive since 2004. Please check the date on older items before answering them.

We tend to ignore item that are six months or older.

Don, seems that the topic of answering old threads was brought up recently:

https://www.askmehelpdesk.com/feedba...ds-564242.html

Seems the AMHD policy is leave it alone, unless it is spam or otherwise bad advice, then RIP it.

I need to review the answer given by Byron, and I may need to make some corrections, as he/she appears to be confusing equipment ground conductor with ungrounded conductor (neutral).

For example, this is a confusing statement:

In a commercial wiring system when using metal conduit it is common practice to use a shared neutral

I never heard of this practice before.

This statement is even more scary:

but the energy is spent and the neutral or common simply acts as a second leg of the circuit providing a ground.

Bryon needs to be informed that electric utilities do not use an equipment ground:

As defined by our local electric company a neutral or common is simply a ground that has less than 0.1 ohm of impedance.

This statement refers to equipment grounding:

there is also a secondary machine ground run in all three wire circuits and the conduit serves as a fail safe ground to boot.

I am not sure where to begin dealing with this post when it starts with:

215.4 Feeders with Common Neutral.

??

Byron, care to have a discussion about your answer?